<html>
    <header>
        <title>form body</title>
        <link rel="stylesheet" href="./formbody.css"></link>
    </header>
    <body>
        <form action="http://localhost:4000" method="post">
            <input type="text" name="usename">
            <input type="text" name="password">
            <input type="text" name="age">
            <input type="submit" value="提交">
        </form>
        <script type="text/javascript" src="./formbody.js"></script>
    </body>
</html>